I've mentioned him before.
Started out in Praxis, and just got wierder from there. He's done a lot of work with Les Claypool, toured with him in a psudo-rendition of Priums about 8 years ago (it was Les, Buckethead and Brain), also was in the one off project Colnel Claypool's Bucket of Bernie Brains ("C2B2" - Claypool, Bernie Worrel, Brain & Buckethead). Did some work with the reformed GNR. Attempted to do some work with Ozzy, but they didn't get along so it was kind of short lived.
BTW, the youtube stuff is just a scratch on the surface, he has some very, very avant-garde & eclectic solo albums out there that are not easy to take.